panel - Often
refers to a wood, copper,
Masonite, or other hard
surfaces on which to paint. Sometimes it is referred
to as a board. Artists of the Gothic
and Renaissance periods often
painted on panels, at first with tempera,
and later with oils, prepared
beforehand with a layer of gesso.
More recent artists
have painted on panels too. Today, the material
most commonly used as a panel is a manufactured
product with the trade name Masonite, available from hardware
stores, as well as from other sellers of artists' supplies. Works
of graffiti on the sides
of trains, buildings, etc. are referred to as painted on panels
too.